Abstract
Abstract In order to solve the problem of low frequency vibration control more effectively, a new type of inertial actuator is proposed in this paper, which is different from the conventional type in that the linear stiffness is replaced by the quasi-zero stiffness. In this design, the structure mainly consisting of a horizontal spring and connecting rod provides negative stiffness to offset the positive stiffness of the vertical spring, which not only ensures sufficient static load capacity, but also reduces the dynamic stiffness of the mass near the equilibrium position. In this study, a restoring force characteristic of the actuator (i.e., the influence of the quasi-zero stiffness structure on the mapping relationship between the restoring force and displacement) is investigated. Then the nonlinear differential equations of the quasi-zero stiffness actuator are derived. The dynamic characteristic of the actuator is discussed based on the harmonic balance method, and the accuracy is proved by numerical verification. The dynamic simulation results show that the quasi-zero stiffness structure can effectively reduce the natural frequency of the actuator, and its performance in low frequency band is better than that of the corresponding linear actuator.
Published Version
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